Convert CloudFormation YAML format to JSON format

cloudformation-yaml-to-json.py

#!/usr/bin/env python
import sys, yaml, json

def funcparse(loader, node):
  node.value = {
    yaml.constructor.ScalarNode:   loader.construct_scalar,
    yaml.constructor.SequenceNode: loader.construct_sequence,
    yaml.constructor.MappingNode:  loader.construct_mapping,
  }[type(node)](node)
  node.tag = node.tag.replace(u'!Ref', 'Ref').replace(u'!', u'Fn::')
  return dict([ (node.tag, node.value) ])

funcnames = [ 'Ref', 'Base64', 'FindInMap', 'GetAtt', 'GetAZs', 'ImportValue',
              'Join', 'Select', 'Split', 'Split', 'Sub', 'And', 'Equals', 'If',
              'Not', 'Or' ]

for func in funcnames:
  yaml.SafeLoader.add_constructor(u'!' + func, funcparse)

json.dump(yaml.safe_load(sys.stdin), sys.stdout, indent=4)